Asymmetry in the current sheet and secondary magnetic flux ropes during guide field magnetic reconnection
文献类型：期刊论文
| 作者 | Wang, Rongsheng; Nakamura, Rumi; Lu, Quanming; Du, Aimin; Zhang, Tielong; Baumjohann, Wolfgang; Khotyaintsev, Yuri V.; Volwerk, Martin; Andre, Mats; Fujimoto, M. |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
 |
| 出版日期 | 2012 |
| 卷号 | 117页码:A07223 |
| ISSN号 | 2169-9380 |
| 通讯作者 | Wang, RS (reprint author), Austrian Acad Sci, Space Res Inst, AT-8042 Graz, Austria. |
| 中文摘要 | A magnetic reconnection event with a moderate guide field encountered by Cluster in the near-Earth tail on 28 August 2002 is reported. The guide field points dawnward during this event. The quadrupolar structure of the Hall magnetic field within the ion diffusion region is distorted toward the northern hemisphere in the earthward part while toward the southern hemisphere tailward part of X-line. Observations of current density and electron pitch angle distribution indicate that the distorted quadrupolar structure is formed due to a deformed Hall electron current system. Cluster crossed the ion diffusion region from south to north earthward of the X-line. An electron density cavity is confirmed in the northern separatrix layer while a thin current layer (TCL) is measured in the southern separatrix layer. The TCL is formed due to electrons injected into the X-line along the magnetic field. These observations are different from simulation results where the cavity is produced associated with inflow electrons along the southern separatrix while the strong current sheet appears with the outflow electron beam along the northern separatrix. The energy of the inflowing electron in the separatrix layer could extend up to 10 keV. Energetic electron fluxes up to 50 keV have a clear peak in the TCL. The length of the separatrix layer is estimated to be at least 65 c/omega(pi). These observations suggest that electrons could be pre-accelerated before they are ejected into the X-line region along the separatrix. Multiple secondary flux ropes moving earthward are observed within the diffusion region. These secondary flux ropes are all identified earthward of the observed TCL. These observations further suggest there are numerous small scale structures within the ion diffusion region. |
| 英文摘要 | A magnetic reconnection event with a moderate guide field encountered by Cluster in the near-Earth tail on 28 August 2002 is reported. The guide field points dawnward during this event. The quadrupolar structure of the Hall magnetic field within the ion diffusion region is distorted toward the northern hemisphere in the earthward part while toward the southern hemisphere tailward part of X-line. Observations of current density and electron pitch angle distribution indicate that the distorted quadrupolar structure is formed due to a deformed Hall electron current system. Cluster crossed the ion diffusion region from south to north earthward of the X-line. An electron density cavity is confirmed in the northern separatrix layer while a thin current layer (TCL) is measured in the southern separatrix layer. The TCL is formed due to electrons injected into the X-line along the magnetic field. These observations are different from simulation results where the cavity is produced associated with inflow electrons along the southern separatrix while the strong current sheet appears with the outflow electron beam along the northern separatrix. The energy of the inflowing electron in the separatrix layer could extend up to 10 keV. Energetic electron fluxes up to 50 keV have a clear peak in the TCL. The length of the separatrix layer is estimated to be at least 65 c/omega(pi). These observations suggest that electrons could be pre-accelerated before they are ejected into the X-line region along the separatrix. Multiple secondary flux ropes moving earthward are observed within the diffusion region. These secondary flux ropes are all identified earthward of the observed TCL. These observations further suggest there are numerous small scale structures within the ion diffusion region. |
| 学科主题 | 空间物理 |
| 资助信息 | Austrian Science Fund (FWF) [I429-N16]; National Science Foundation of China (NSFC) [41174122, 41104092]; China Postdoctoral Science Foundation [2011M500030] |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2014-12-15 |
| 源URL | [http://ir.nssc.ac.cn/handle/122/3137]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 推荐引用方式 GB/T 7714 | Wang, Rongsheng,Nakamura, Rumi,Lu, Quanming,et al. Asymmetry in the current sheet and secondary magnetic flux ropes during guide field magnetic reconnection[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2012,117:A07223. |
| APA | Wang, Rongsheng.,Nakamura, Rumi.,Lu, Quanming.,Du, Aimin.,Zhang, Tielong.,...&Lu, San.(2012).Asymmetry in the current sheet and secondary magnetic flux ropes during guide field magnetic reconnection.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,117,A07223. |
| MLA | Wang, Rongsheng,et al."Asymmetry in the current sheet and secondary magnetic flux ropes during guide field magnetic reconnection".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 117(2012):A07223. |
入库方式： OAI收割
来源：国家空间科学中心
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